19913443 has 16 divisors (see below), whose sum is σ = 23296896. Its totient is φ = 16819840.

The previous prime is 19913419. The next prime is 19913447. The reversal of 19913443 is 34431991.

It is a cyclic number.

It is not a de Polignac number, because 19913443 - 2¹³ = 19905251 is a prime.

It is a super-2 number, since 2×19913443² = 793090424228498, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19913399 and 19913408.

It is not an unprimeable number, because it can be changed into a prime (19913447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14880 + ... + 16162.

It is an arithmetic number, because the mean of its divisors is an integer number (1456056).

Almost surely, 2^19913443 is an apocalyptic number.

19913443 is a deficient number, since it is larger than the sum of its proper divisors (3383453).

19913443 is a wasteful number, since it uses less digits than its factorization.

19913443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394.

The product of its digits is 11664, while the sum is 34.

The square root of 19913443 is about 4462.4480949362. The cubic root of 19913443 is about 271.0496089788.

The spelling of 19913443 in words is "nineteen million, nine hundred thirteen thousand, four hundred forty-three".